<?php

/**
 * @file
 * Field Info API, providing information about available fields and field types.
 */

/**
 * @defgroup field_info Field Info API
 * @{
 * Obtain information about Field API configuration.
 *
 * The Field Info API exposes information about field types, fields,
 * instances, bundles, widget types, display formatters, behaviors,
 * and settings defined by or with the Field API.
 *
 * See @link field Field API @endlink for information about the other parts of
 * the Field API.
 */

/**
 * Clears the field info cache without clearing the field data cache.
 *
 * This is useful when deleted fields or instances are purged.  We
 * need to remove the purged records, but no actual field data items
 * are affected.
 */
function field_info_cache_clear() {
	drupal_static_reset('field_view_mode_settings');
	drupal_static_reset('field_available_languages');

	// @todo: Remove this when field_attach_*_bundle() bundle management
	// functions are moved to the entity API.
	entity_info_cache_clear();

	_field_info_collate_types(TRUE);
	_field_info_collate_fields(TRUE);
}

/**
 * Collates all information on field types, widget types and related structures.
 *
 * @param $reset
 *   If TRUE, clear the cache. The information will be rebuilt from the database
 *   next time it is needed. Defaults to FALSE.
 *
 * @return
 *   If $reset is TRUE, nothing.
 *   If $reset is FALSE, an array containing the following elements:
 *   - 'field types': Array of hook_field_info() results, keyed by field_type.
 *     Each element has the following components: label, description, settings,
 *     instance_settings, default_widget, default_formatter, and behaviors
 *     from hook_field_info(), as well as module, giving the module that exposes
 *     the field type.
 *   - 'widget types': Array of hook_field_widget_info() results, keyed by
 *     widget_type. Each element has the following components: label, field
 *     types, settings, and behaviors from hook_field_widget_info(), as well
 *     as module, giving the module that exposes the widget type.
 *   - 'formatter types': Array of hook_field_formatter_info() results, keyed by
 *     formatter_type. Each element has the following components: label, field
 *     types, and behaviors from hook_field_formatter_info(), as well as
 *     module, giving the module that exposes the formatter type.
 *   - 'storage types': Array of hook_field_storage_info() results, keyed by
 *     storage type names. Each element has the following components: label,
 *     description, and settings from hook_field_storage_info(), as well as
 *     module, giving the module that exposes the storage type.
 *   - 'fieldable types': Array of hook_entity_info() results, keyed by
 *     entity_type. Each element has the following components: name, id key,
 *     revision key, bundle key, cacheable, and bundles from hook_entity_info(),
 *     as well as module, giving the module that exposes the entity type.
 */
function _field_info_collate_types($reset = FALSE) {
	global $language;
	static $info;

	// The _info() hooks invoked below include translated strings, so each
	// language is cached separately.
	$langcode = $language->language;

	if ($reset) {
		$info = NULL;
		// Clear all languages.
		cache_clear_all('field_info_types:', 'cache_field', TRUE);
		return;
	}

	if (!isset($info)) {
		if ($cached = cache_get("field_info_types:$langcode", 'cache_field')) {
			$info = $cached->data;
		}
		else {
			$info = array(
					'field types' => array(),
					'widget types' => array(),
					'formatter types' => array(),
					'storage types' => array(),
			);

			// Populate field types.
			foreach (module_implements('field_info') as $module) {
				$field_types = (array) module_invoke($module, 'field_info');
				foreach ($field_types as $name => $field_info) {
					// Provide defaults.
					$field_info += array(
							'settings' => array(),
							'instance_settings' => array(),
					);
					$info['field types'][$name] = $field_info;
					$info['field types'][$name]['module'] = $module;
				}
			}
			drupal_alter('field_info', $info['field types']);

			// Populate widget types.
			foreach (module_implements('field_widget_info') as $module) {
				$widget_types = (array) module_invoke($module, 'field_widget_info');
				foreach ($widget_types as $name => $widget_info) {
					// Provide defaults.
					$widget_info += array(
							'settings' => array(),
					);
					$info['widget types'][$name] = $widget_info;
					$info['widget types'][$name]['module'] = $module;
				}
			}
			drupal_alter('field_widget_info', $info['widget types']);

			// Populate formatter types.
			foreach (module_implements('field_formatter_info') as $module) {
				$formatter_types = (array) module_invoke($module, 'field_formatter_info');
				foreach ($formatter_types as $name => $formatter_info) {
					// Provide defaults.
					$formatter_info += array(
							'settings' => array(),
					);
					$info['formatter types'][$name] = $formatter_info;
					$info['formatter types'][$name]['module'] = $module;
				}
			}
			drupal_alter('field_formatter_info', $info['formatter types']);

			// Populate storage types.
			foreach (module_implements('field_storage_info') as $module) {
				$storage_types = (array) module_invoke($module, 'field_storage_info');
				foreach ($storage_types as $name => $storage_info) {
					// Provide defaults.
					$storage_info += array(
							'settings' => array(),
					);
					$info['storage types'][$name] = $storage_info;
					$info['storage types'][$name]['module'] = $module;
				}
			}
			drupal_alter('field_storage_info', $info['storage types']);

			cache_set("field_info_types:$langcode", $info, 'cache_field');
		}
	}

	return $info;
}

/**
 * Collates all information on existing fields and instances.
 *
 * @param $reset
 *   If TRUE, clear the cache. The information will be rebuilt from the
 *   database next time it is needed. Defaults to FALSE.
 *
 * @return
 *   If $reset is TRUE, nothing.
 *   If $reset is FALSE, an array containing the following elements:
 *   - fields: Array of existing fields, keyed by field ID. This element
 *     lists deleted and non-deleted fields, but not inactive ones.
 *     Each field has an additional element, 'bundles', which is an array
 *     of all non-deleted instances of that field.
 *   - field_ids: Array of field IDs, keyed by field name. This element
 *     only lists non-deleted, active fields.
 *   - instances: Array of existing instances, keyed by entity type, bundle
 *     name and field name. This element only lists non-deleted instances
 *     whose field is active.
 */
function _field_info_collate_fields($reset = FALSE) {
	static $info;

	if ($reset) {
		$info = NULL;
		cache_clear_all('field_info_fields', 'cache_field');
		return;
	}

	if (!isset($info)) {
		if ($cached = cache_get('field_info_fields', 'cache_field')) {
			$info = $cached->data;
		}
		else {
			$definitions = array(
					'field_ids' => field_read_fields(array(), array('include_deleted' => 1)),
					'instances' => field_read_instances(),
			);

			// Populate 'fields' with all fields, keyed by ID.
			$info['fields'] = array();
			foreach ($definitions['field_ids'] as $key => $field) {
				$info['fields'][$key] = $definitions['field_ids'][$key] = _field_info_prepare_field($field);
			}

			// Build an array of field IDs for non-deleted fields, keyed by name.
			$info['field_ids'] = array();
			foreach ($info['fields'] as $key => $field) {
				if (!$field['deleted']) {
					$info['field_ids'][$field['field_name']] = $key;
				}
			}

			// Populate 'instances'. Only non-deleted instances are considered.
			$info['instances'] = array();
			foreach (field_info_bundles() as $entity_type => $bundles) {
				foreach ($bundles as $bundle => $bundle_info) {
					$info['instances'][$entity_type][$bundle] = array();
				}
			}
			foreach ($definitions['instances'] as $instance) {
				$field = $info['fields'][$instance['field_id']];
				$instance = _field_info_prepare_instance($instance, $field);
				$info['instances'][$instance['entity_type']][$instance['bundle']][$instance['field_name']] = $instance;
				// Enrich field definitions with the list of bundles where they have
				// instances. NOTE: Deleted fields in $info['field_ids'] are not
				// enriched because all of their instances are deleted, too, and
				// are thus not in $definitions['instances'].
				$info['fields'][$instance['field_id']]['bundles'][$instance['entity_type']][] = $instance['bundle'];
			}

			// Populate 'extra_fields'.
			$extra = module_invoke_all('field_extra_fields');
			drupal_alter('field_extra_fields', $extra);
			// Merge in saved settings.
			foreach ($extra as $entity_type => $bundles) {
				foreach ($bundles as $bundle => $extra_fields) {
					$extra_fields = _field_info_prepare_extra_fields($extra_fields, $entity_type, $bundle);
					$info['extra_fields'][$entity_type][$bundle] = $extra_fields;
				}
			}

			cache_set('field_info_fields', $info, 'cache_field');
		}
	}

	return $info;
}

/**
 * Prepares a field definition for the current run-time context.
 *
 * Since the field was last saved or updated, new field settings can be
 * expected.
 *
 * @param $field
 *   The raw field structure as read from the database.
 */
function _field_info_prepare_field($field) {
	// Make sure all expected field settings are present.
	$field['settings'] += field_info_field_settings($field['type']);
	$field['storage']['settings'] += field_info_storage_settings($field['storage']['type']);

	// Add storage details.
	$details = (array) module_invoke($field['storage']['module'], 'field_storage_details', $field);
	drupal_alter('field_storage_details', $details, $field, $instance);
	$field['storage']['details'] = $details;

	// Initialize the 'bundles' list.
	$field['bundles'] = array();

	return $field;
}

/**
 * Prepares an instance definition for the current run-time context.
 *
 * Since the instance was last saved or updated, a number of things might have
 * changed: widgets or formatters disabled, new settings expected, new view
 * modes added...
 *
 * @param $instance
 *   The raw instance structure as read from the database.
 * @param $field
 *   The field structure for the instance.
 *
 * @return
 *   Field instance array.
 */
function _field_info_prepare_instance($instance, $field) {
	// Make sure all expected instance settings are present.
	$instance['settings'] += field_info_instance_settings($field['type']);

	// Set a default value for the instance.
	if (field_behaviors_widget('default value', $instance) == FIELD_BEHAVIOR_DEFAULT && !isset($instance['default_value'])) {
		$instance['default_value'] = NULL;
	}

	$instance['widget'] = _field_info_prepare_instance_widget($field, $instance['widget']);

	foreach ($instance['display'] as $view_mode => $display) {
		$instance['display'][$view_mode] = _field_info_prepare_instance_display($field, $display);
	}

	// Fallback to 'hidden' for view modes configured to use custom display
	// settings, and for which the instance has no explicit settings.
	$entity_info = entity_get_info($instance['entity_type']);
	$view_modes = array_merge(array('default'), array_keys($entity_info['view modes']));
	$view_mode_settings = field_view_mode_settings($instance['entity_type'], $instance['bundle']);
	foreach ($view_modes as $view_mode) {
		if ($view_mode == 'default' || !empty($view_mode_settings[$view_mode]['custom_settings'])) {
			if (!isset($instance['display'][$view_mode])) {
				$instance['display'][$view_mode] = array(
						'type' => 'hidden',
						'label' => 'above',
						'settings' => array(),
						'weight' => 0,
				);
			}
		}
	}

	return $instance;
}

/**
 * Adapts display specifications to the current run-time context.
 *
 * @param $field
 *   The field structure for the instance.
 * @param $display
 *   Display specifications as found in
 *   $instance['display']['some_view_mode'].
 */
function _field_info_prepare_instance_display($field, $display) {
	$field_type = field_info_field_types($field['type']);

	// Fill in default values.
	$display += array(
			'label' => 'above',
			'type' => $field_type['default_formatter'],
			'settings' => array(),
			'weight' => 0,
	);
	if ($display['type'] != 'hidden') {
		$formatter_type = field_info_formatter_types($display['type']);
		// Fallback to default formatter if formatter type is not available.
		if (!$formatter_type) {
			$display['type'] = $field_type['default_formatter'];
			$formatter_type = field_info_formatter_types($display['type']);
		}
		$display['module'] = $formatter_type['module'];
		// Fill in default settings for the formatter.
		$display['settings'] += field_info_formatter_settings($display['type']);
	}

	return $display;
}

/**
 * Prepares widget specifications for the current run-time context.
 *
 * @param $field
 *   The field structure for the instance.
 * @param $widget
 *   Widget specifications as found in $instance['widget'].
 */
function _field_info_prepare_instance_widget($field, $widget) {
	$field_type = field_info_field_types($field['type']);

	// Fill in default values.
	$widget += array(
			'type' => $field_type['default_widget'],
			'settings' => array(),
			'weight' => 0,
	);

	$widget_type = field_info_widget_types($widget['type']);
	// Fallback to default formatter if formatter type is not available.
	if (!$widget_type) {
		$widget['type'] = $field_type['default_widget'];
		$widget_type = field_info_widget_types($widget['type']);
	}
	$widget['module'] = $widget_type['module'];
	// Fill in default settings for the widget.
	$widget['settings'] += field_info_widget_settings($widget['type']);

	return $widget;
}

/**
 * Prepares 'extra fields' for the current run-time context.
 *
 * @param $extra_fields
 *   The array of extra fields, as collected in hook_field_extra_fields().
 * @param $entity_type
 *   The entity type.
 * @param $bundle
 *   The bundle name.
 */
function _field_info_prepare_extra_fields($extra_fields, $entity_type, $bundle) {
	$entity_type_info = entity_get_info($entity_type);
	$bundle_settings = field_bundle_settings($entity_type, $bundle);
	$extra_fields += array('form' => array(), 'display' => array());

	$result = array();
	// Extra fields in forms.
	foreach ($extra_fields['form'] as $name => $field_data) {
		$settings = isset($bundle_settings['extra_fields']['form'][$name]) ? $bundle_settings['extra_fields']['form'][$name] : array();
		if (isset($settings['weight'])) {
			$field_data['weight'] = $settings['weight'];
		}
		$result['form'][$name] = $field_data;
	}

	// Extra fields in displayed entities.
	$data = $extra_fields['display'];
	foreach ($extra_fields['display'] as $name => $field_data) {
		$settings = isset($bundle_settings['extra_fields']['display'][$name]) ? $bundle_settings['extra_fields']['display'][$name] : array();
		$view_modes = array_merge(array('default'), array_keys($entity_type_info['view modes']));
		foreach ($view_modes as $view_mode) {
			if (isset($settings[$view_mode])) {
				$field_data['display'][$view_mode] = $settings[$view_mode];
			}
			else {
				$field_data['display'][$view_mode] = array(
						'weight' => $field_data['weight'],
						'visible' => TRUE,
				);
			}
		}
		unset($field_data['weight']);
		$result['display'][$name] = $field_data;
	}

	return $result;
}

/**
 * Determines the behavior of a widget with respect to an operation.
 *
 * @param $op
 *   The name of the operation. Currently supported: 'default value',
 *   'multiple values'.
 * @param $instance
 *   The field instance array.
 *
 * @return
 *   One of these values:
 *   - FIELD_BEHAVIOR_NONE: Do nothing for this operation.
 *   - FIELD_BEHAVIOR_CUSTOM: Use the widget's callback function.
 *   - FIELD_BEHAVIOR_DEFAULT: Use field.module default behavior.
 */
function field_behaviors_widget($op, $instance) {
	$info = field_info_widget_types($instance['widget']['type']);
	return isset($info['behaviors'][$op]) ? $info['behaviors'][$op] : FIELD_BEHAVIOR_DEFAULT;
}

/**
 * Returns information about field types from hook_field_info().
 *
 * @param $field_type
 *   (optional) A field type name. If omitted, all field types will be
 *   returned.
 *
 * @return
 *   Either a field type description, as provided by hook_field_info(), or an
 *   array of all existing field types, keyed by field type name.
 */
function field_info_field_types($field_type = NULL) {
	$info = _field_info_collate_types();
	$field_types = $info['field types'];
	if ($field_type) {
		if (isset($field_types[$field_type])) {
			return $field_types[$field_type];
		}
	}
	else {
		return $field_types;
	}
}

/**
 * Returns information about field widgets from hook_field_widget_info().
 *
 * @param $widget_type
 *   (optional) A widget type name. If omitted, all widget types will be
 *   returned.
 *
 * @return
 *   Either a single widget type description, as provided by
 *   hook_field_widget_info(), or an array of all existing widget types, keyed
 *   by widget type name.
 */
function field_info_widget_types($widget_type = NULL) {
	$info = _field_info_collate_types();
	$widget_types = $info['widget types'];
	if ($widget_type) {
		if (isset($widget_types[$widget_type])) {
			return $widget_types[$widget_type];
		}
	}
	else {
		return $widget_types;
	}
}

/**
 * Returns information about field formatters from hook_field_formatter_info().
 *
 * @param $formatter_type
 *   (optional) A formatter type name. If omitted, all formatter types will be
 *   returned.
 *
 * @return
 *   Either a single formatter type description, as provided by
 *   hook_field_formatter_info(), or an array of all existing formatter types,
 *   keyed by formatter type name.
 */
function field_info_formatter_types($formatter_type = NULL) {
	$info = _field_info_collate_types();
	$formatter_types = $info['formatter types'];
	if ($formatter_type) {
		if (isset($formatter_types[$formatter_type])) {
			return $formatter_types[$formatter_type];
		}
	}
	else {
		return $formatter_types;
	}
}

/**
 * Returns information about field storage from hook_field_storage_info().
 *
 * @param $storage_type
 *   (optional) A storage type name. If omitted, all storage types will be
 *   returned.
 *
 * @return
 *   Either a storage type description, as provided by
 *   hook_field_storage_info(), or an array of all existing storage types,
 *   keyed by storage type name.
 */
function field_info_storage_types($storage_type = NULL) {
	$info = _field_info_collate_types();
	$storage_types = $info['storage types'];
	if ($storage_type) {
		if (isset($storage_types[$storage_type])) {
			return $storage_types[$storage_type];
		}
	}
	else {
		return $storage_types;
	}
}

/**
 * Returns information about existing bundles.
 *
 * @param $entity_type
 *   The type of entity; e.g. 'node' or 'user'.
 *
 * @return
 *   An array of bundles for the $entity_type keyed by bundle name,
 *   or, if no $entity_type was provided, the array of all existing bundles,
 *   keyed by entity type.
 */
function field_info_bundles($entity_type = NULL) {
	$info = entity_get_info();

	if ($entity_type) {
		return isset($info[$entity_type]['bundles']) ? $info[$entity_type]['bundles'] : array();
	}

	$bundles = array();
	foreach ($info as $type => $entity_info) {
		$bundles[$type] = $entity_info['bundles'];
	}
	return $bundles;
}

/**
 * Returns all field definitions.
 *
 * @return
 *   An array of field definitions, keyed by field name. Each field has an
 *   additional property, 'bundles', which is an array of all the bundles to
 *   which this field belongs keyed by entity type.
 */
function field_info_fields() {
	$fields = array();
	$info = _field_info_collate_fields();
	foreach ($info['fields'] as $key => $field) {
		if (!$field['deleted']) {
			$fields[$field['field_name']] = $field;
		}
	}
	return $fields;
}

/**
 * Returns data about an individual field, given a field name.
 *
 * @param $field_name
 *   The name of the field to retrieve. $field_name can only refer to a
 *   non-deleted, active field. For deleted fields, use
 *   field_info_field_by_id(). To retrieve information about inactive fields,
 *   use field_read_fields().
 *
 * @return
 *   The field array, as returned by field_read_fields(), with an
 *   additional element 'bundles', whose value is an array of all the bundles
 *   this field belongs to keyed by entity type.
 *
 * @see field_info_field_by_id()
 */
function field_info_field($field_name) {
	$info = _field_info_collate_fields();
	if (isset($info['field_ids'][$field_name])) {
		return $info['fields'][$info['field_ids'][$field_name]];
	}
}

/**
 * Returns data about an individual field, given a field ID.
 *
 * @param $field_id
 *   The id of the field to retrieve. $field_id can refer to a
 *   deleted field, but not an inactive one.
 *
 * @return
 *   The field array, as returned by field_read_fields(), with an
 *   additional element 'bundles', whose value is an array of all the bundles
 *   this field belongs to.
 *
 * @see field_info_field()
 */
function field_info_field_by_id($field_id) {
	$info = _field_info_collate_fields();
	if (isset($info['fields'][$field_id])) {
		return $info['fields'][$field_id];
	}
}

/**
 * Returns the same data as field_info_field_by_id() for every field.
 *
 * This function is typically used when handling all fields of some entities
 * to avoid thousands of calls to field_info_field_by_id().
 *
 * @return
 *   An array, each key is a field ID and the values are field arrays as
 *   returned by field_read_fields(), with an additional element 'bundles',
 *   whose value is an array of all the bundle this field belongs to.
 *
 * @see field_info_field()
 * @see field_info_field_by_id()
 */
function field_info_field_by_ids() {
	$info = _field_info_collate_fields();
	return $info['fields'];
}

/**
 * Retrieves information about field instances.
 *
 * @param $entity_type
 *   The entity type for which to return instances.
 * @param $bundle_name
 *   The bundle name for which to return instances.
 *
 * @return
 *   If $entity_type is not set, return all instances keyed by entity type and
 *   bundle name. If $entity_type is set, return all instances for that entity
 *   type, keyed by bundle name. If $entity_type and $bundle_name are set, return
 *   all instances for that bundle.
 */
function field_info_instances($entity_type = NULL, $bundle_name = NULL) {
	$info = _field_info_collate_fields();
	if (!isset($entity_type)) {
		return $info['instances'];
	}
	if (!isset($bundle_name)) {
		return $info['instances'][$entity_type];
	}
	if (isset($info['instances'][$entity_type][$bundle_name])) {
		return $info['instances'][$entity_type][$bundle_name];
	}
	return array();
}

/**
 * Returns an array of instance data for a specific field and bundle.
 *
 * @param $entity_type
 *   The entity type for the instance.
 * @param $field_name
 *   The field name for the instance.
 * @param $bundle_name
 *   The bundle name for the instance.
 */
function field_info_instance($entity_type, $field_name, $bundle_name) {
	$info = _field_info_collate_fields();
	if (isset($info['instances'][$entity_type][$bundle_name][$field_name])) {
		return $info['instances'][$entity_type][$bundle_name][$field_name];
	}
}

/**
 * Returns a list and settings of pseudo-field elements in a given bundle.
 *
 * If $context is 'form', an array with the following structure:
 * @code
 *   array(
 *     'name_of_pseudo_field_component' => array(
 *       'label' => The human readable name of the component,
 *       'description' => A short description of the component content,
 *       'weight' => The weight of the component in edit forms,
 *     ),
 *     'name_of_other_pseudo_field_component' => array(
 *       // ...
 *     ),
 *   );
 * @endcode
 *
 * If $context is 'display', an array with the following structure:
 * @code
 *   array(
 *     'name_of_pseudo_field_component' => array(
 *       'label' => The human readable name of the component,
 *       'description' => A short description of the component content,
 *       // One entry per view mode, including the 'default' mode:
 *       'display' => array(
 *         'default' => array(
 *           'weight' => The weight of the component in displayed entities in
 *             this view mode,
 *           'visible' => TRUE if the component is visible, FALSE if hidden, in
 *             displayed entities in this view mode,
 *         ),
 *         'teaser' => array(
 *           // ...
 *         ),
 *       ),
 *     ),
 *     'name_of_other_pseudo_field_component' => array(
 *       // ...
 *     ),
 *   );
 * @endcode
 *
 * @param $entity_type
 *   The type of entity; e.g. 'node' or 'user'.
 * @param $bundle
 *   The bundle name.
 * @param $context
 *   The context for which the list of pseudo-fields is requested. Either
 *   'form' or 'display'.
 *
 * @return
 *   The array of pseudo-field elements in the bundle.
 */
function field_info_extra_fields($entity_type, $bundle, $context) {
	$info = _field_info_collate_fields();
	if (isset($info['extra_fields'][$entity_type][$bundle][$context])) {
		return $info['extra_fields'][$entity_type][$bundle][$context];
	}
	return array();
}

/**
 * Returns the maximum weight of all the components in an entity.
 *
 * This includes fields, 'extra_fields', and other components added by
 * third-party modules (e.g. field_group).
 *
 * @param $entity_type
 *   The type of entity; e.g. 'node' or 'user'.
 * @param $bundle
 *   The bundle name.
 * @param $context
 *   The context for which the maximum weight is requested. Either 'form', or
 *   the name of a view mode.
 * @return
 *   The maximum weight of the entity's components, or NULL if no components
 *   were found.
 */
function field_info_max_weight($entity_type, $bundle, $context) {
	$weights = array();

	// Collect weights for fields.
	foreach (field_info_instances($entity_type, $bundle) as $instance) {
		if ($context == 'form') {
			$weights[] = $instance['widget']['weight'];
		}
		elseif (isset($instance['display'][$context]['weight'])) {
			$weights[] = $instance['display'][$context]['weight'];
		}
	}
	// Collect weights for extra fields.
	foreach (field_info_extra_fields($entity_type, $bundle, $context) as $extra) {
		$weights[] = $extra['weight'];
	}

	// Let other modules feedback about their own additions.
	$weights = array_merge($weights, module_invoke_all('field_info_max_weight', $entity_type, $bundle, $context));
	$max_weight = $weights ? max($weights) : NULL;

	return $max_weight;
}

/**
 * Returns a field type's default settings.
 *
 * @param $type
 *   A field type name.
 *
 * @return
 *   The field type's default settings, as provided by hook_field_info(), or an
 *   empty array if type or settings are not defined.
 */
function field_info_field_settings($type) {
	$info = field_info_field_types($type);
	return isset($info['settings']) ? $info['settings'] : array();
}

/**
 * Returns a field type's default instance settings.
 *
 * @param $type
 *   A field type name.
 *
 * @return
 *   The field type's default instance settings, as provided by
 *   hook_field_info(), or an empty array if type or settings are not defined.
 */
function field_info_instance_settings($type) {
	$info = field_info_field_types($type);
	return isset($info['instance_settings']) ? $info['instance_settings'] : array();
}

/**
 * Returns a field widget's default settings.
 *
 * @param $type
 *   A widget type name.
 *
 * @return
 *   The widget type's default settings, as provided by
 *   hook_field_widget_info(), or an empty array if type or settings are
 *   undefined.
 */
function field_info_widget_settings($type) {
	$info = field_info_widget_types($type);
	return isset($info['settings']) ? $info['settings'] : array();
}

/**
 * Returns a field formatter's default settings.
 *
 * @param $type
 *   A field formatter type name.
 *
 * @return
 *   The formatter type's default settings, as provided by
 *   hook_field_formatter_info(), or an empty array if type or settings are
 *   undefined.
 */
function field_info_formatter_settings($type) {
	$info = field_info_formatter_types($type);
	return isset($info['settings']) ? $info['settings'] : array();
}

/**
 * Returns a field storage type's default settings.
 *
 * @param $type
 *   A field storage type name.
 *
 * @return
 *   The storage type's default settings, as provided by
 *   hook_field_storage_info(), or an empty array if type or settings are
 *   undefined.
 */
function field_info_storage_settings($type) {
	$info = field_info_storage_types($type);
	return isset($info['settings']) ? $info['settings'] : array();
}

/**
 * @} End of "defgroup field_info"
 */
